L 26 ] 
1818. 
Thermometer 
without. 
Thermometer 
within. 
Barometer. 
* 
Six’s Thermometer. 
Rain.t 
Greatest 
height. 
Least 
height. 
Mean 
height. 
Greatest 
height. 
Least 
height 
Mean 
height. 
Greatest 
height. 
Least 
height. 
Mean 
height. 
Greatest 
height. 
Least 
height. 
Mean 
height. 
Deg. 
Deg. 
Deg. 
Deg. 
Deg. 
Deg. 
Inches. 
Inches. 
Inches. 
Deg. 
Deg. 
Deg. 
Inches. 
January 
53 
28 
4>,7 
59 
41 
5 1 »4 
30,5° 
29,02 
29,82 
55 
26 
41,1 
1,461 
February 
5 1 
26 
00 
CO 
62 
42 
51,6 
30,22 
29,05 
29.72 
5 6 
26 
3 7 > 6 
0,727 
March 
5 1 
33 
43 >° 
68 
46 
54,5 
3°'34 
28,84 
29,67 
55 
3 * 
43,3 
0,986 
April 
64 
40 
48,4 
68 
51 
57,9 
30,40 
29,13 
2 9 . 7 « 
6 5 
33 
48,5 
r, 79 i 
May 
69 
48 
56,0 
68 
53 
60,4 
3 °, 3 5 
2 9’34 
29,84 
69 
4 i 
55,4 
>,597 
June 
78 
57 
66,1 
77 
60 
67,8 
3°’34 
29,65 
3°»°3 
85 
50 
66,1 
0,407 
July 
80 
61 
68,9 
81 
64 
70,4 
3 °> 3 ° 
29,80 
30,05 
89 
53 
69,5 
0,361 
August 
77 
53 
65,6 
77 
54 
66,4 
► 
30,28 
29,91 
30,08 
85 
55 
68,1 
0,278 
September 
69 
5 1 
62,3 
7 ° 
52 
6 3>5 
30,21 
29.55 
29,86 
77 
50 
64,3 
0,972 
October 
66 
48 
56,2 
69 
52 
59 > 6 
3 0 .32 
29.33 
29,87 
68 
4 i 
56,6 
1,166 
November 
59 
39 
50,8 
66 
52 
58,7 
30.48 
29.34 
29,85 
59 
39 
51,6 
1,084 
December 
5 ° 
24 
39 > 6 
62 
43 
52,7 
30,61 
29,44 
30,07 
59 
25 
40,4 
0,806 
Whole year 
53 >i 
5 9 , 6 
29,88 
53,5 
11,636 
* The quicksilver in the bason of the barometer, is 81 feet above the level 
of low water spring tides at Somerset-house. 
f The Society’s Rain Gage is 1 14 feet above the sajne level, and 75 feet 
6 inches above the surrounding ground. 
Mean variation of the magnetic needle, June 1818, 24 0 15' 43" West. 
Dip about 70° 51'. 
